What would cause the brake pedal to drop when the engine is started

Asked by Blue1966 Nov 22, 2014 at 06:21 PM about the 1966 Ford Thunderbird

Question type: Maintenance & Repair

After replacing the master cylinder on a 66 T Bird the brake pedal now goes to the floor
when the engine is started, this must be an issue with the booster

5 Answers
15,895

Larry answered 9 years ago

Check all your vacuum lines to the booster. There is probably a "Y" connector and one line may be off or loose.

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Jaylud answered 7 years ago

What ended up being the problem? I have the same issue. Thanks

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15,895

Larry answered 7 years ago

65 &6 have two different connectors to the booster. one is a "Y" and the other is just a straight through. Be sure to listen to you engine when it starts and see if you can hear a hissing sound. That would be a vacuum leak somewhere.

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